Sheridan County Weed and Pest District strongly discourages the use of pyrethroid-based insecticides such as Mustang MAXX for the treatment of alfalfa weevils. This is because extensive alfalfa weevil resistance to this type of treatment has been documented in Sheridan County. 

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Instead, Sheridan County suggests that an integrated pest management program be implemented with Steward insecticide as the chemical component. Integrated pest management involves a rotation of different treatment types (chemical, mechanical, cultural, biological). Using more than one tool in our toolbox contributes to long-term management of target species and can both help prevent and hedge against the potential loss of availability of tools - as we have seen with pyrethroids. 

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Sheridan County Weed and Pest has decided that continuing to cost-share for the treatment of alfalfa weevils is no longer responsible from a financial standpoint or from a long-term pest control standpoint. As such, SCWP will not be cost-sharing for Steward or any other insecticide for the treatment of alfalfa weevils in 2023. For more info, please join us for our informational meeting April 19. 

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